Abstract

ABSTRACT A linear analysis and numerical simulation are presented for Doppler-shifted cyclotron harmonicsgenerated in the cyclotron autoresonance klystron 1,2 The harmonic-generation mechanism in theCARK is similar to the one in the ordinary klystron: First, an oscillation at the basic Doppler-shiftedcyclotron frequency is excited in the main resonator of the CARK. Then, bunched electron beam excitesharmonics in an additional quasi-optical resonator tilted to the main resonator. Because of shorteningof wavelength both by harmonic-generation mechanism and Doppler effect very high frequencies are attainable in this device. For example, one could obtain radiation with wavelength of about 0 . I mm using an electron beam with the energy of electrons of about I MeV and a magnetic field of I 00 kG . Itis essential, that there is no threshold condition for harmonic generation. Thus, it is possible to generate harmonics even with low electron beam current and/or poor Q-factor of a resonator.It is shown, that the efficiency of generation of the low harmonics (harmonic number 2÷5) can exceedI 0%. The efficiency of generation of the I 0th harmonic can be of the order I %.Comparative analysis of the CARK harmonic generator and the FEL harmonic generator is given.

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